acpica/executer/exfield.c

0001 /******************************************************************************
0002  *
0003  * Module Name: exfield - AML execution - FieldUnit read/write
0004  *
0005  *****************************************************************************/
0006
0007 /******************************************************************************
0008  *
0009  * 1. Copyright Notice
0010  *
0011  * Some or all of this work - Copyright (c) 1999 - 2024, Intel Corp.
0012  * All rights reserved.
0013  *
0014  * 2. License
0015  *
0016  * 2.1. This is your license from Intel Corp. under its intellectual property
0017  * rights. You may have additional license terms from the party that provided
0018  * you this software, covering your right to use that party's intellectual
0019  * property rights.
0020  *
0021  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
0022  * copy of the source code appearing in this file ("Covered Code") an
0023  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
0024  * base code distributed originally by Intel ("Original Intel Code") to copy,
0025  * make derivatives, distribute, use and display any portion of the Covered
0026  * Code in any form, with the right to sublicense such rights; and
0027  *
0028  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
0029  * license (with the right to sublicense), under only those claims of Intel
0030  * patents that are infringed by the Original Intel Code, to make, use, sell,
0031  * offer to sell, and import the Covered Code and derivative works thereof
0032  * solely to the minimum extent necessary to exercise the above copyright
0033  * license, and in no event shall the patent license extend to any additions
0034  * to or modifications of the Original Intel Code. No other license or right
0035  * is granted directly or by implication, estoppel or otherwise;
0036  *
0037  * The above copyright and patent license is granted only if the following
0038  * conditions are met:
0039  *
0040  * 3. Conditions
0041  *
0042  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
0043  * Redistribution of source code of any substantial portion of the Covered
0044  * Code or modification with rights to further distribute source must include
0045  * the above Copyright Notice, the above License, this list of Conditions,
0046  * and the following Disclaimer and Export Compliance provision. In addition,
0047  * Licensee must cause all Covered Code to which Licensee contributes to
0048  * contain a file documenting the changes Licensee made to create that Covered
0049  * Code and the date of any change. Licensee must include in that file the
0050  * documentation of any changes made by any predecessor Licensee. Licensee
0051  * must include a prominent statement that the modification is derived,
0052  * directly or indirectly, from Original Intel Code.
0053  *
0054  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
0055  * Redistribution of source code of any substantial portion of the Covered
0056  * Code or modification without rights to further distribute source must
0057  * include the following Disclaimer and Export Compliance provision in the
0058  * documentation and/or other materials provided with distribution. In
0059  * addition, Licensee may not authorize further sublicense of source of any
0060  * portion of the Covered Code, and must include terms to the effect that the
0061  * license from Licensee to its licensee is limited to the intellectual
0062  * property embodied in the software Licensee provides to its licensee, and
0063  * not to intellectual property embodied in modifications its licensee may
0064  * make.
0065  *
0066  * 3.3. Redistribution of Executable. Redistribution in executable form of any
0067  * substantial portion of the Covered Code or modification must reproduce the
0068  * above Copyright Notice, and the following Disclaimer and Export Compliance
0069  * provision in the documentation and/or other materials provided with the
0070  * distribution.
0071  *
0072  * 3.4. Intel retains all right, title, and interest in and to the Original
0073  * Intel Code.
0074  *
0075  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
0076  * Intel shall be used in advertising or otherwise to promote the sale, use or
0077  * other dealings in products derived from or relating to the Covered Code
0078  * without prior written authorization from Intel.
0079  *
0080  * 4. Disclaimer and Export Compliance
0081  *
0082  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
0083  * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
0084  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
0085  * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
0086  * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
0087  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
0088  * PARTICULAR PURPOSE.
0089  *
0090  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
0091  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
0092  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
0093  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
0094  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
0095  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
0096  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
0097  * LIMITED REMEDY.
0098  *
0099  * 4.3. Licensee shall not export, either directly or indirectly, any of this
0100  * software or system incorporating such software without first obtaining any
0101  * required license or other approval from the U. S. Department of Commerce or
0102  * any other agency or department of the United States Government. In the
0103  * event Licensee exports any such software from the United States or
0104  * re-exports any such software from a foreign destination, Licensee shall
0105  * ensure that the distribution and export/re-export of the software is in
0106  * compliance with all laws, regulations, orders, or other restrictions of the
0107  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
0108  * any of its subsidiaries will export/re-export any technical data, process,
0109  * software, or service, directly or indirectly, to any country for which the
0110  * United States government or any agency thereof requires an export license,
0111  * other governmental approval, or letter of assurance, without first obtaining
0112  * such license, approval or letter.
0113  *
0114  *****************************************************************************
0115  *
0116  * Alternatively, you may choose to be licensed under the terms of the
0117  * following license:
0118  *
0119  * Redistribution and use in source and binary forms, with or without
0120  * modification, are permitted provided that the following conditions
0121  * are met:
0122  * 1. Redistributions of source code must retain the above copyright
0123  *    notice, this list of conditions, and the following disclaimer,
0124  *    without modification.
0125  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
0126  *    substantially similar to the "NO WARRANTY" disclaimer below
0127  *    ("Disclaimer") and any redistribution must be conditioned upon
0128  *    including a substantially similar Disclaimer requirement for further
0129  *    binary redistribution.
0130  * 3. Neither the names of the above-listed copyright holders nor the names
0131  *    of any contributors may be used to endorse or promote products derived
0132  *    from this software without specific prior written permission.
0133  *
0134  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
0135  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
0136  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
0137  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
0138  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
0139  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
0140  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
0141  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
0142  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
0143  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
0144  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
0145  *
0146  * Alternatively, you may choose to be licensed under the terms of the
0147  * GNU General Public License ("GPL") version 2 as published by the Free
0148  * Software Foundation.
0149  *
0150  *****************************************************************************/
0151
0152 #include "acpi.h"
0153 #include "accommon.h"
0154 #include "acdispat.h"
0155 #include "acinterp.h"
0156 #include "amlcode.h"
0157
0158
0159 #define _COMPONENT          ACPI_EXECUTER
0160         ACPI_MODULE_NAME    ("exfield")
0161
0162
0163 /*
0164  * This table maps the various Attrib protocols to the byte transfer
0165  * length. Used for the generic serial bus.
0166  */
0167 #define ACPI_INVALID_PROTOCOL_ID        0x80
0168 #define ACPI_MAX_PROTOCOL_ID            0x0F
0169
0170 static const UINT8      AcpiProtocolLengths[] =
0171 {
0172     ACPI_INVALID_PROTOCOL_ID,   /* 0 - reserved */
0173     ACPI_INVALID_PROTOCOL_ID,   /* 1 - reserved */
0174     0x00,                       /* 2 - ATTRIB_QUICK */
0175     ACPI_INVALID_PROTOCOL_ID,   /* 3 - reserved */
0176     0x01,                       /* 4 - ATTRIB_SEND_RECEIVE */
0177     ACPI_INVALID_PROTOCOL_ID,   /* 5 - reserved */
0178     0x01,                       /* 6 - ATTRIB_BYTE */
0179     ACPI_INVALID_PROTOCOL_ID,   /* 7 - reserved */
0180     0x02,                       /* 8 - ATTRIB_WORD */
0181     ACPI_INVALID_PROTOCOL_ID,   /* 9 - reserved */
0182     0xFF,                       /* A - ATTRIB_BLOCK  */
0183     0xFF,                       /* B - ATTRIB_BYTES */
0184     0x02,                       /* C - ATTRIB_PROCESS_CALL */
0185     0xFF,                       /* D - ATTRIB_BLOCK_PROCESS_CALL */
0186     0xFF,                       /* E - ATTRIB_RAW_BYTES */
0187     0xFF                        /* F - ATTRIB_RAW_PROCESS_BYTES */
0188 };
0189
0190 #define PCC_MASTER_SUBSPACE     3
0191
0192 /*
0193  * The following macros determine a given offset is a COMD field.
0194  * According to the specification, generic subspaces (types 0-2) contains a
0195  * 2-byte COMD field at offset 4 and master subspaces (type 3) contains a 4-byte
0196  * COMD field starting at offset 12.
0197  */
0198 #define GENERIC_SUBSPACE_COMMAND(a)     (4 == a || a == 5)
0199 #define MASTER_SUBSPACE_COMMAND(a)      (12 <= a && a <= 15)
0200
0201
0202 /*******************************************************************************
0203  *
0204  * FUNCTION:    AcpiExGetProtocolBufferLength
0205  *
0206  * PARAMETERS:  ProtocolId      - The type of the protocol indicated by region
0207  *                                field access attributes
0208  *              ReturnLength    - Where the protocol byte transfer length is
0209  *                                returned
0210  *
0211  * RETURN:      Status and decoded byte transfer length
0212  *
0213  * DESCRIPTION: This routine returns the length of the GenericSerialBus
0214  *              protocol bytes
0215  *
0216  ******************************************************************************/
0217
0218 ACPI_STATUS
0219 AcpiExGetProtocolBufferLength (
0220     UINT32                  ProtocolId,
0221     UINT32                  *ReturnLength)
0222 {
0223
0224     if ((ProtocolId > ACPI_MAX_PROTOCOL_ID) ||
0225         (AcpiProtocolLengths[ProtocolId] == ACPI_INVALID_PROTOCOL_ID))
0226     {
0227         ACPI_ERROR ((AE_INFO,
0228             "Invalid Field/AccessAs protocol ID: 0x%4.4X", ProtocolId));
0229
0230         return (AE_AML_PROTOCOL);
0231     }
0232
0233     *ReturnLength = AcpiProtocolLengths[ProtocolId];
0234     return (AE_OK);
0235 }
0236
0237
0238 /*******************************************************************************
0239  *
0240  * FUNCTION:    AcpiExReadDataFromField
0241  *
0242  * PARAMETERS:  WalkState           - Current execution state
0243  *              ObjDesc             - The named field
0244  *              RetBufferDesc       - Where the return data object is stored
0245  *
0246  * RETURN:      Status
0247  *
0248  * DESCRIPTION: Read from a named field. Returns either an Integer or a
0249  *              Buffer, depending on the size of the field and whether if a
0250  *              field is created by the CreateField() operator.
0251  *
0252  ******************************************************************************/
0253
0254 ACPI_STATUS
0255 AcpiExReadDataFromField (
0256     ACPI_WALK_STATE         *WalkState,
0257     ACPI_OPERAND_OBJECT     *ObjDesc,
0258     ACPI_OPERAND_OBJECT     **RetBufferDesc)
0259 {
0260     ACPI_STATUS             Status;
0261     ACPI_OPERAND_OBJECT     *BufferDesc;
0262     void                    *Buffer;
0263     UINT32                  BufferLength;
0264
0265
0266     ACPI_FUNCTION_TRACE_PTR (ExReadDataFromField, ObjDesc);
0267
0268
0269     /* Parameter validation */
0270
0271     if (!ObjDesc)
0272     {
0273         return_ACPI_STATUS (AE_AML_NO_OPERAND);
0274     }
0275     if (!RetBufferDesc)
0276     {
0277         return_ACPI_STATUS (AE_BAD_PARAMETER);
0278     }
0279
0280     if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD)
0281     {
0282         /*
0283          * If the BufferField arguments have not been previously evaluated,
0284          * evaluate them now and save the results.
0285          */
0286         if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
0287         {
0288             Status = AcpiDsGetBufferFieldArguments (ObjDesc);
0289             if (ACPI_FAILURE (Status))
0290             {
0291                 return_ACPI_STATUS (Status);
0292             }
0293         }
0294     }
0295     else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
0296         (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS ||
0297          ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS ||
0298          ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_IPMI  ||
0299          ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_PLATFORM_RT ||
0300          ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_FIXED_HARDWARE))
0301     {
0302         /* SMBus, GSBus, IPMI serial */
0303
0304         Status = AcpiExReadSerialBus (ObjDesc, RetBufferDesc);
0305         return_ACPI_STATUS (Status);
0306     }
0307
0308     /*
0309      * Allocate a buffer for the contents of the field.
0310      *
0311      * If the field is larger than the current integer width, create
0312      * a BUFFER to hold it. Otherwise, use an INTEGER. This allows
0313      * the use of arithmetic operators on the returned value if the
0314      * field size is equal or smaller than an Integer.
0315      *
0316      * However, all buffer fields created by CreateField operator needs to
0317      * remain as a buffer to match other AML interpreter implementations.
0318      *
0319      * Note: Field.length is in bits.
0320      */
0321     BufferLength = (ACPI_SIZE) ACPI_ROUND_BITS_UP_TO_BYTES (
0322         ObjDesc->Field.BitLength);
0323
0324     if (BufferLength > AcpiGbl_IntegerByteWidth ||
0325         (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD &&
0326         ObjDesc->BufferField.IsCreateField))
0327     {
0328         /* Field is too large for an Integer, create a Buffer instead */
0329
0330         BufferDesc = AcpiUtCreateBufferObject (BufferLength);
0331         if (!BufferDesc)
0332         {
0333             return_ACPI_STATUS (AE_NO_MEMORY);
0334         }
0335         Buffer = BufferDesc->Buffer.Pointer;
0336     }
0337     else
0338     {
0339         /* Field will fit within an Integer (normal case) */
0340
0341         BufferDesc = AcpiUtCreateIntegerObject ((UINT64) 0);
0342         if (!BufferDesc)
0343         {
0344             return_ACPI_STATUS (AE_NO_MEMORY);
0345         }
0346
0347         BufferLength = AcpiGbl_IntegerByteWidth;
0348         Buffer = &BufferDesc->Integer.Value;
0349     }
0350
0351     if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
0352         (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GPIO))
0353     {
0354         /* General Purpose I/O */
0355
0356         Status = AcpiExReadGpio (ObjDesc, Buffer);
0357         goto Exit;
0358     }
0359     else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
0360         (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_PLATFORM_COMM))
0361     {
0362         /*
0363          * Reading from a PCC field unit does not require the handler because
0364          * it only requires reading from the InternalPccBuffer.
0365          */
0366         ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
0367             "PCC FieldRead bits %u\n", ObjDesc->Field.BitLength));
0368
0369         memcpy (Buffer, ObjDesc->Field.RegionObj->Field.InternalPccBuffer +
0370         ObjDesc->Field.BaseByteOffset, (ACPI_SIZE) ACPI_ROUND_BITS_UP_TO_BYTES (
0371             ObjDesc->Field.BitLength));
0372
0373         *RetBufferDesc = BufferDesc;
0374         return AE_OK;
0375     }
0376
0377     ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
0378         "FieldRead [TO]:   Obj %p, Type %X, Buf %p, ByteLen %X\n",
0379         ObjDesc, ObjDesc->Common.Type, Buffer, BufferLength));
0380     ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
0381         "FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
0382         ObjDesc->CommonField.BitLength,
0383         ObjDesc->CommonField.StartFieldBitOffset,
0384         ObjDesc->CommonField.BaseByteOffset));
0385
0386     /* Lock entire transaction if requested */
0387
0388     AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
0389
0390     /* Read from the field */
0391
0392     Status = AcpiExExtractFromField (ObjDesc, Buffer, BufferLength);
0393     AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
0394
0395
0396 Exit:
0397     if (ACPI_FAILURE (Status))
0398     {
0399         AcpiUtRemoveReference (BufferDesc);
0400     }
0401     else
0402     {
0403         *RetBufferDesc = BufferDesc;
0404     }
0405
0406     return_ACPI_STATUS (Status);
0407 }
0408
0409
0410 /*******************************************************************************
0411  *
0412  * FUNCTION:    AcpiExWriteDataToField
0413  *
0414  * PARAMETERS:  SourceDesc          - Contains data to write
0415  *              ObjDesc             - The named field
0416  *              ResultDesc          - Where the return value is returned, if any
0417  *
0418  * RETURN:      Status
0419  *
0420  * DESCRIPTION: Write to a named field
0421  *
0422  ******************************************************************************/
0423
0424 ACPI_STATUS
0425 AcpiExWriteDataToField (
0426     ACPI_OPERAND_OBJECT     *SourceDesc,
0427     ACPI_OPERAND_OBJECT     *ObjDesc,
0428     ACPI_OPERAND_OBJECT     **ResultDesc)
0429 {
0430     ACPI_STATUS             Status;
0431     UINT32                  BufferLength;
0432     UINT32                  DataLength;
0433     void                    *Buffer;
0434
0435
0436     ACPI_FUNCTION_TRACE_PTR (ExWriteDataToField, ObjDesc);
0437
0438
0439     /* Parameter validation */
0440
0441     if (!SourceDesc || !ObjDesc)
0442     {
0443         return_ACPI_STATUS (AE_AML_NO_OPERAND);
0444     }
0445
0446     if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD)
0447     {
0448         /*
0449          * If the BufferField arguments have not been previously evaluated,
0450          * evaluate them now and save the results.
0451          */
0452         if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
0453         {
0454             Status = AcpiDsGetBufferFieldArguments (ObjDesc);
0455             if (ACPI_FAILURE (Status))
0456             {
0457                 return_ACPI_STATUS (Status);
0458             }
0459         }
0460     }
0461     else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
0462         (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GPIO))
0463     {
0464         /* General Purpose I/O */
0465
0466         Status = AcpiExWriteGpio (SourceDesc, ObjDesc, ResultDesc);
0467         return_ACPI_STATUS (Status);
0468     }
0469     else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
0470         (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS ||
0471          ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS ||
0472          ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_IPMI  ||
0473          ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_PLATFORM_RT ||
0474          ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_FIXED_HARDWARE))
0475     {
0476         /* SMBus, GSBus, IPMI serial */
0477
0478         Status = AcpiExWriteSerialBus (SourceDesc, ObjDesc, ResultDesc);
0479         return_ACPI_STATUS (Status);
0480     }
0481     else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
0482              (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_PLATFORM_COMM))
0483     {
0484         /*
0485          * According to the spec a write to the COMD field will invoke the
0486          * region handler. Otherwise, write to the PccInternal buffer. This
0487          * implementation will use the offsets specified rather than the name
0488          * of the field. This is considered safer because some firmware tools
0489          * are known to obfiscate named objects.
0490          */
0491         DataLength = (ACPI_SIZE) ACPI_ROUND_BITS_UP_TO_BYTES (
0492             ObjDesc->Field.BitLength);
0493         memcpy (ObjDesc->Field.RegionObj->Field.InternalPccBuffer +
0494             ObjDesc->Field.BaseByteOffset,
0495             SourceDesc->Buffer.Pointer, DataLength);
0496
0497         if (MASTER_SUBSPACE_COMMAND (ObjDesc->Field.BaseByteOffset))
0498         {
0499             /* Perform the write */
0500
0501             ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
0502                 "PCC COMD field has been written. Invoking PCC handler now.\n"));
0503
0504             Status = AcpiExAccessRegion (
0505                 ObjDesc, 0, (UINT64 *) ObjDesc->Field.RegionObj->Field.InternalPccBuffer,
0506                 ACPI_WRITE);
0507             return_ACPI_STATUS (Status);
0508         }
0509         return (AE_OK);
0510     }
0511
0512
0513     /* Get a pointer to the data to be written */
0514
0515     switch (SourceDesc->Common.Type)
0516     {
0517     case ACPI_TYPE_INTEGER:
0518
0519         Buffer = &SourceDesc->Integer.Value;
0520         BufferLength = sizeof (SourceDesc->Integer.Value);
0521         break;
0522
0523     case ACPI_TYPE_BUFFER:
0524
0525         Buffer = SourceDesc->Buffer.Pointer;
0526         BufferLength = SourceDesc->Buffer.Length;
0527         break;
0528
0529     case ACPI_TYPE_STRING:
0530
0531         Buffer = SourceDesc->String.Pointer;
0532         BufferLength = SourceDesc->String.Length;
0533         break;
0534
0535     default:
0536         return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
0537     }
0538
0539     ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
0540         "FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
0541         SourceDesc, AcpiUtGetTypeName (SourceDesc->Common.Type),
0542         SourceDesc->Common.Type, Buffer, BufferLength));
0543
0544     ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
0545         "FieldWrite [TO]:   Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
0546         ObjDesc, AcpiUtGetTypeName (ObjDesc->Common.Type),
0547         ObjDesc->Common.Type,
0548         ObjDesc->CommonField.BitLength,
0549         ObjDesc->CommonField.StartFieldBitOffset,
0550         ObjDesc->CommonField.BaseByteOffset));
0551
0552     /* Lock entire transaction if requested */
0553
0554     AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
0555
0556     /* Write to the field */
0557
0558     Status = AcpiExInsertIntoField (ObjDesc, Buffer, BufferLength);
0559     AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
0560     return_ACPI_STATUS (Status);
0561 }